The US think-tank ISIS has apparently published the full text of Iran's response to a negotiation offer by the United Nations. The paper was previously classified, but was available for public download - for a while.

The full URL to the download was:

http://www.isis-online.org/publications/iran/responsetext.pdf

However, this URL now returns a 404 error. Apparently someone got cold feet (or into hot water) and pulled the file.

The link to it (second from top) is still on the index page however.

This is a scaled screenshot of the page. The text is just about legible:

Unfortunately, Google's cache didn't snatch it yet, or this bit of news would be a lot more interesting.